AI 中文总结
本研究提出基于无能级交叉快速绝热通道的里德伯原子多量子比特门方案，可高保真制备多类多量子比特纠缠态，对脉冲参数波动稳健，为中性原子量子信息处理提供了高效纠缠态制备方法。
AI 中文摘要
我们提出一种基于无能级交叉脉冲的快速绝热通道（RAP）方案，用于在里德伯原子系统中确定性制备多量子比特纠缠态。与依赖能级交叉的传统RAP协议不同，本方法采用反对称拉比频率和偶对称失谐，可在不经过任何能级交叉的情况下实现稳健的布居转移。通过利用里德伯阻塞效应，该协议可从初始乘积态直接制备纠缠态。具体而言，两个由π_g脉冲分隔的连续RAP脉冲可生成两量子比特贝尔态、三量子比特W态、四量子比特GHZ态及六量子比特蜂窝状W态。数值模拟显示，贝尔态和三量子比特W态的保真度超过0.9997，四量子比特GHZ态的保真度达到0.997，六量子比特蜂窝状W态的保真度超过0.9995。该方案对脉冲参数波动表现出优异的稳健性，在±5%的参数变化下，保真度仍保持在0.99以上。本研究为中性原子量子信息处理中的纠缠态制备提供了一种简单、高效且稳健的方法。
英文摘要
We propose a rapid adiabatic passage (RAP) scheme based on level-crossing-free pulses for deterministic generation of multiqubit entangled states in Rydberg atom systems. Unlike conventional RAP protocols that rely on level crossings, our approach uses an antisymmetric Rabi frequency and an even-symmetric detuning, enabling robust population transfer without passing through any level crossing. By exploiting the Rydberg blockade effect, the protocol prepares entangled states directly from an initial product state. Specifically, two sequential RAP pulses separated by a pi_g pulse generate two-qubit Bell states, three-qubit W states, four-qubit GHZ states, and six-qubit honeycomb W states. Numerical simulations show that the fidelities exceed 0.9997 for the Bell and three-qubit W states, reach 0.997 for the four-qubit GHZ state, and surpass 0.9995 for the six-qubit honeycomb W state. The scheme demonstrates excellent robustness against pulse parameter fluctuations, with fidelities remaining above 0.99 under +/-5% parameter variations. This work provides a simple, efficient, and robust method for entangled-state preparation in neutral-atom quantum information processing.
